CVE-2026-8075
Posting a malicious markdown image crashes the Mattermost Desktop App
CVSS Score
6.5
EPSS Score
0.0%
EPSS Percentile
0th
Mattermost Desktop App versions <=6.2 5.5.13 6.0.2.0 fail to properly null check when checking for headers in the Mattermost Desktop App which allows any user to crash another channel members Desktop App via posting a malicious link with an embedded image that misses one of those headers. Mattermost Advisory ID: MMSA-2026-00668
| CWE | CWE-754 |
| Vendor | mattermost |
| Product | mattermost |
| Published | Jul 17, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
Mattermost / Mattermost
0 ≤ 5.5.13 0 ≤ 6.0.2
Credits
Jopraveen